X2
I don't understand why people are so quick to dismiss random mutations as simply deleterious or judging recessive mutations as bad. In humans, achondroplasia is an inheritable autosomal dominant mutation of dwarfism. Albinism is another quick one to dismiss, yet many albino herps in the trade have been found as sub-adults to adults; Burmese pythons (iirc), Mohave rattlesnake, cal king, trans pecos rat snakes, etc. Some of these mutations can even be environmentally triggered: incubation temp fluxuations, humidity swings, in vitro injuries. There are a number of ways mutations, good or bad, that can arise and even be potentially inheritable.